advice-remove is a compiled Lisp function in `nadvice.el'.

(advice-remove SYMBOL FUNCTION)

Like `remove-function' but for the function named SYMBOL.
Contrary to `remove-function', this also works when SYMBOL is a macro
or an autoload and it preserves `fboundp'.
Instead of the actual function to remove, FUNCTION can also be the `name'
of the piece of advice.